Question: What causes our universe to have a density of 1e-27?
Paraphrase: Explain why our universe has a density of 1e-27:
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q221392 p:P2054 ?s . ?s ps:P2054 ?x filter(contains(?x , '1e-27')) . ?s pq:P1480 ?value}